In the projects area there are a lot, because each project has a sticky. Projects are run by someone on the board for members to sign up to and then take part in. Generally there are a couple a year.
In the projects area the past projects are all stickys as a lot of other threads in that area discuss the sign up and plant choice of the projects, so it's good to be able to easily find the actual projects when you want to give an update on how your plant is doing.
In other areas they are posts of special interest which moderators/admins have decided want to be kept at the top to make them more visible to members. Often members suggest which threads should be stickes.
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